Slider for slide fasteners and method for making the same



.De. s, 1944. AWTZRY 2,364,100

SLIDER FOR SLIDE FASTENERS AND METHOD FQR MAKING THE SAME Filed Sept.12, 1940 2 Sheets-Sheet 1 2O l F I {HIIHHIIHII-I/ vunuwinl VH2 26 I 2620 I '38 A0 20 A. SAVITZKY Dec. 5, 1944.

SLIDER FOR SLIDE FASTENERS AND METHOD FOR MAKING THE SAME 2 Shets-Sheet2 Filed Sept. 12, 1940 .0 I i'. f5: 1 O

INVENTOR Aryan/44M Sill/172A r 2 AT i RNEY ing use.

Patented. Dec. 5, 1944 UNITED. STATES PATENT OFFI SLIDER FOR sum:FASTENERS AND METHOD FOR MAKING THE SAME Abraham Savitzky, Bronx, N. Y..assignor to Marvel Slide Fastener Corporation, New Yor N. Y., acorporation of New York 1 Application September 12, 1940, Serial No.356,417

27 Claims. This invention relates to sliders for Principally, theinvention is directed to the production of a slider which, althoughfabricated from sheet metal, is characterized by a high resistance toundesirable deformation during both manufacture and use. 7

Qne aspect of my invention resides in the novel form imparted to theslider neck. In sliders heretofore made it hasbeen necessary to resortto many expedients to secure a rigid slider neck which would prevent thefront and back plates or the slider from spreading'or compressing dur-Thus in sheet metal sliders, rivets, yoke's, weldingand the like deviceshavebeen employed for securing the necessary strength of slider neck.But these devices render the slider bulky inwappearance, and undulyincrease the;

Sliderswhich have been cost of manufacture. manufactured by coining haveemployed special dies to create anextra' thickness of metal at the neck,but this has entailed additional manufacturing expense, coined slidersbeing more expensive to manufacture than sheet metal sliders.

cal to produce and pleasing in appearance.

Another object of my invention is concerned with the ball from which theslider finger piece depends. Heretofore this ball has been formed by acoining or upsetting operation,- by employing additional parts whichwere riveted or welded to the slider body, or by striking upwards aportion of a wing to form an'embryonic bail member. This latter methodof providing a ball, although economical, considerably weakens the wingon which it is formed and-results in a; spreading of the slider flangesassociated with slide fasteners and to a method for making the same.

joint between the slider wings the resistance to spread-' the cup. Inthis manner I produce a strong, imperforate wing with a bail integrallyformed thereon, at a low cost of manufacture.

Other objects ofthis invention will in'part be obvious and in parthereinafter pointed out.

The invention accordingly consists in the features of construction,combinations of elements,

and. arrangement of parts which will be exemplifled in the constructionhereinafter described, and of which the scope ofapplication will beindicated in the claims.

In the accompanying drawings, in which is shown one of the variouspossible embodiments of this invention,

Fig. 1 is a sectional view through :a pair of cooperating die membersshowing the cupping operation being performed on a slider strip duringthe formation of a bail;

Fig. 2 is a sectional view taken substantially along the planerepresented by the line 2-2 in Fig. l;

Fig. 3 is a sectional view through a pair of cooperating die membersshowing the process of collapsing certain portions of the side wall ofthe cup to complete the bail;

Fig. 4 is an elevational view of a strip my novel bail members formedtherein;

Fig. 5 is a top plan view thereof;

Fig. 6 is a sectional view taken substantially along the planerepresented by the line 6-4 in Fig. 5;

Fig. 7 is a plan view of a slider blank after havin 1 the bail memberhas been-formed therein;

ation of said dies;

ship; and

the said wing, throwing them out of alignment with the correspondingslider flanges associated with the unmutilated wing. In accordance withmy invention, the bail is formed by cupping the material of one of thewings and then collapsing Fig. 8 is a sectional view cooperating diemembers showing an early step during the process of forming my novelslider neck;

Fig. 9 is a similar view at a later stage of oper- Fig. 10 is asectional view taken substantially along the plane represented by theline IU-lll in Fig. 9;

- Figs. 11 and 12 are mid-sectional views in elevation and plan of aslider ejected from the dies shown in Fig. 9 after the wings thereofhave been brought into parallel superposed relation- Figs. 13, 14, 15and 16 are front, side, 'rear and top views respectively of a finishedslider embodying mylnvention.

Referring now to the drawings, and more particularly to Figs, 1 through7, I have shown the bail-forming slider.

A strip 20 of sheet metal is first passed through through a pair ofsteps in the production of my novel a pair of cooperating die memberscomprising a therein which cooperates with a plunger 26 to form a raisedcup 28 on the lower surface of the strip 28. -I'. prefer to form saidcup 28 in two pressing operations, during the first of which the cup isdrawn slightly larger than the ultimate size required, and in thesecondof which the cup is die'block 22 having a cavity'24 suitablyformed brought down to the desired dimensions shown in Figs. 1 and 2.However, said cup may be formed in any number of steps desired.

After the cupping'operation, the strip is advanced to a pair ofcooperating die members 88 and 32 having a pair of aligned fingers 84and 36 which are adapted to press into the opposite side walls 38 and 48(see Fig.2) of the cup 28 to cola lapse the same inwardly into the shapeshown in Fig. 3. It will be seen from Fig.- 3 that the upper portions 38and 48 of the said walls of the" cup are shifted into the plane of thestrip 28 so as to form a continuous web; that the lower portions 42 and'44 of the side walls are forced into abutment with the bottom of thecup to provide a reinforcement for the upper ridge 46 on the bail member41; and that the central portions 48 and 68 of the side walls are firmlypressed the bail is formed) will assume the configuration indicated inFigs. 3, '5 and 6, comprising to outwardappearance a pair of juxtaposedelongated rectangular surfaces having raised central portions.

Subsequent to the formation of the bail members, the strip is stamped byany conventional means to form slider blanks such as shown in Fig. "I.The slider blanks may then be processed either individually or in thestrip, in any manner well known to the art, to provide the usual flanges64 and to shape the slider blanks into a V form (shown in Fig. 8). Itshould be noted that as both the slider wings are of substantially thesame imperforate cross section, they will offer the same resistance tobending, so that the flanges 64 on both wings will be similarlydisposed.

After the slider has been'fashioned tothe V'- shape, it is processed inthe series of operations indicated in Figs. 8 12 to form a slider neckin accordance with my invention. First the slider is inserted into a dieblock 66 having a trough 68 provided therein which has a slot 68 on oneof its inclined surfaces to slidably receive the bail member 41 andposition thelslider The trough opens into the lower surface of the dieblock 66 to allow the bottom bent portion 18 of the V-shaped slidernormally maintain the same in its uppermost position. Projecting fromthe upper surface of the die block 18 is a plunger 82 having a roundedconvex forming surface (see Figs. 8, 9. and The top of the said plunger82 is adapted to'be positioned slightly below the lower portion 18. ofthe V-shaped slider when said slider is initially locked betweenthe dieblocks 56 and 62, as indicated in Fig. 8. The die blocks 66 and 62 arethen simultaneously moved downward towards the die block 18, the neckportion 18 of the slider being pressed against the resiliently mountedplunger not discernible to the naked'eye, and like the bail web portions48 and 58 they act toall intents and;

82 and thus forcing the portion 18 inwardly between the walls of thewings 66 and 68 until the vportion l8 assumes the inverted shape shownin Figs. 10 and l1, and abuts against the female die cavity 86 providedfor this purpose at the tip of the finger 68. By resiliently mountingthe plun er 82 I prevent the portion 18' from being struck free from therest of the slider.) By forcing the portion 18 backwards into the slidera deep well 86 is formed in the slider neck perpendicular to the sliderwings, the upper portions 88 and 88 of the side walls of said well beingfirmly pressed against the adjacent ends 92 and 94 of the slider .wings.These adjacent portions are so tightly pressed together that the seambetween them is purposes as a single integral piece of metal.

By thus providing a heavy piece-of metal at the juncture between theneck and the slider wings I appreciably reinforce the'same againstbending at this point. However, the dimension of the plunger 82corresponding to the height of the slider is less than the distancebetween the slider wings so that most of the well 86 is hidden from vsight when viewed from the-front or back wing of the slider, and thusprovid s a highly attractive appearance to the slider- T At this stagein the formation of the slider neck the upper edges 96 and 88 (see Fig.10)

of the groove 86 are spaced apart a relatively I large distance toprovide diverging walls in said groove. After initially forming thegroove 88 the wings of the slider are bent into parallel superposedrelation, as shown in Figs. 11 and 12. This causes the upper edges 86and 88 to approach each other, as shown in Fig. 12, and impart a nearlyclosed shape to the neck section.

The slider may finally be shaped to bring it to dimensions and to removethe slightly prov truding. edges adjacent theupper end of the groove,which are shown in Fig. 11, and thus provide the finished appearanceindicated in Figs.

13 through 18. From Figs. 13-16 it will be seen that the transversewallsv I88 and I82 of the maintain the slider plates 66 and 68 in spaced7 relationship; but that these webs are for the most to protrude. Acooperating die block 62, which is mounted for reciprocation into theblock 66, has

a finger portion 84 which is adapted to enter between the inner walls ofthe wings 66 and 68 of the slider and to tightly press the same againstthe block 86 and lock the slider between the die blocks 66 and 62. Belowthe block 88 I provide --a table inserts a station r o suitably groove86 provide extremely deep webs which part concealed beneath the sliderwings and thus avoid the unsightly appearance which would be caused by adeep V indented in the neck of the slider.

I have found that a slider constructed in accordance with my inventionoifers about 58% more resistance to'spreading or compressing of theslider plates and does not tend to jam either originally or. duringcontinued use due to misalignment of the slider flanges.

It will thus be seen that there is Provided "device and method formaking the same in which the several objects of this invention areachieved...

and which is well adapted to meet the conditions ainst the lower surfaceof the die bl k 18 to (ii of practical use, I v

As various possible embodiments mightbe made of the above invention, andas various changes might be made in the embodiments above set forth, itis to be understood that all matter herein-set forth or shown in theaccompanying drawings is to be interpreted as illustrative and not inalimiting sense. 7

Having thus described my invention, I claim as new and desire to secureby Letters Patent:

1. In a method of manufacturing a sheet metal slider for a slidefastener, the steps comprising disposing a pair of slider wingsinterconnected by an integral neck portion in angular relationship withrespect to each other, indenting the neck portion and then bending saidwings into parallel superposed relationship.

2. In a method of manufacturing a sheet metal slider for a slidefastener from a blank including a pair of wings interconnected'by anintegral neck, the steps comprising disposingsaid wings in relativelyangular relationship, creasing said neck transversely of the planes ofsaid wings and from one to the other of said angularly disposed wings tosuch an extent that the bottom of the formed crease near the front andback of said slider is below the adjacent edges of said wings, and thenbending said wings into parallel superposed relationship.

3. In a method of manufacturing a'sheet metal slider for a slidefastener, the. steps comprising disposing a pair of slider wingsinterconnected by an integral neck portion in angular relationship withrespect to each other, indenting a deep well in said neck portion, andbending said wings into parallel superposed relationship.

4. In a method of manufacturing a sheet metal .slider for a slidefastener comprising a pair of parallel wings interconnected by anintegral neck,

that step comprising creasing said neck transversely of the planes ofsaid wings and from one to the other of said wings to such an extentthat I forming a cup on one of the wings, pressing oppositely disposedportions of said cup into abutment with each other, and pressingportions of said cup into the plane of said wing. 7

9. A sheet metal slider for a slide fastener comhas an elongatedinwardly extendingindentation therein whose longitudinal axis istransverse to the planes of said wings.

10. A sheet metal slider fora slide fastener comprising a pair ofparallel sheet metal wings interconnected by an integral sheet metalneck which has an elongated inwardly extending indentation .thereinwhose longitudinal axis is transverse to the planes of said wings, thebottom of said indentation being below the adjacent top edges of saidwings. Q

11. A sheet metal slider fora slide fastener comprising a. pair ofparallel sheet metal wings interconnected by an'integral sheet metalneck which has an elongated inwardly extending indentation therein whoselongitudinal axis is transverse to the planes of said wings, said neckhaving an inwardly bowed arcuate cross-section in a plane parallel tothe direction of travel of the bottom of the formed crease near thefrontand back of said slider is below the adjacent edges of saidwlngs.

5. In a method of manufacturing a sheet metal slider for a slidefastener wherein said slider the slider and including the. longitudinalaxis of said indentation.

12. A sheet metal slider for a slide fastener comprising a pair ofparallel sheet metal wings interconnectedby an integral sheet metal neckwhich has an elongated'inwardly extending in-" dentation therein whoselongitudinal axis is transverse to the planes of said wings, said neckhaving an inwardly bowedarcuate cross-section in a planeparallel to thedirection of travel of the slider and including the longitudinal axis ofsaid indentation, and an inwardly bowed arcuate cross-section in a planeperpendicular to said first named plane and likewise. direction oftravel of the slider.

13. A sheet metal slider for a slide fastener comprising av pair ofparallel wings interconcomprises a pair of slider wings interconnected vby an integral neck portion, the steps comprising forming a cup on oneof said wings, pressing oppositely disposed portions of said cup intoabutment with each'other, pressing portions of said cup into the planeof said wing, indenting a deep well in said neck, and compressingwallportions of said well against said wings.

6. In a method of manufacturing a sheet metal slider for a slidefastener, the steps .comprising forming a cup on one of the wings andcollapsing oppositely disposed portions of said cup into juxtapositionbeneath an intermediate portion" of the said cup between the portionscollapsed. while leaving said intermediate portion uncollapsed toprovide a rim around the juxtaposed collapsed portions extending to bothsides thereof.

7. In a method of manufacturing a sheet metal slider for a slidefastener, the steps comprising provide a rim around said web extendingto both sides of the plane thereof.

8. In a method of manufacturing a sheet metal slider for a slidefastener, the steps comprising nected by an integral neck, saidneck.h'aving an indentation therein between said wings, the ends of thebottom of said indentation lying adjacent said wings, the bottom of saidindentation intermediate the ends thereof being no higher than saidends.

14. A sheet metal slider for a slide fastener comprising a pair ofparallel wings interconnected byan integral neck, said neck having anindentation'thereln between said wings, the ends of said indentationlying adjacent said wings, said ends being higher than the portion ofthe bottom between them. r

15. A sheet metal slider for a slide fastener comprising a pair of wingshaving spaced parallel plane portions interconnected by an integralneck, said neck having an indentation therein two walls whereof extendtransversely between said wings and converge toward the bottom of saidslider; the top edges of said plane portions adjacent the part of theneck where said walls converge being at least as high as the externalsurface of said part.

16. A sheet metal. slider for a slide fastener comprising a pair ofwings interconnected by an leaving said intermediate portion uncollapsedto integral neck, said neck having a well comprising a. bottom. twosides parallel to said wings and two sides perpendicular to said wings,said bottom and the two sides parallelto the wings being disposed whollybetween said wings, the two sides perpendicular to said wings having asubstantial portion thereof disposed between said wings.

parallel to the i being disposed wholly between said wings, the

two sides perpendicular to said wings having a substantial portionthereof disposed between said wings, the neck of said well beingconstricted.

18. A sheet metal slider for a slide fastener comprising a pair of wingsinterconnected by an integral-neck, said neck having a well comprising abottom,-two sides parallel to .said wings and two sides perpendicular tosaid wings, said bottom and the two sides parallel to the wings beingdisposed wholly between said wings, the two sides perpendicular to saidwings having a substantial portion thereof disposed between said wings,the two sides which are parallel to said wings having the upper portionsthereof compressed against said wings.

19. A sheet metal slider for a slide fastener comprising a pair of wingsinterconnected by an integral neck, said neck having a wellformedtherein of elongate, closed, cross-section along a plane adjacent thebottom'of said well, which plane is perpendicular to said wings andextends from side to side thereof, the major dimension ofsaidcross-section being disposed transversely of said wings.

. tions each integrally connected along an edge 20. A sheet metal sliderfor a slide fastener comprising a pair of imperfora'te wingsinterconnected by an integral neck portion, said neck having a deep wellformed therein, said well in-' cluding a bottom and four sides and beingsubstantially fully concealed between said wings, portions of said welllying adjacent said wings being'compressed against said wings, one ofsaid wings having a bail integral therewith.

21. A sheet metal slider for a slide fastener having a pair-of parallelsheet metal win s interconnected by a neck, a bail on one of said saidweb including two plane sheet metal porthereof to said wing andextending away therefrom and said rim including asheet metal striphaving inturned edges each of which isvintegrally connected to theextended edge of oneof the plane web portions, the sheet metal strip andinturned edges thereof being integrally connected to said wing at theends of said bail.

23. A sheet metal slider for a slide fastener having a pair of parallelsheet metal wings interconnected by a neck, an intgeral bail on one ofsaid wings which terminates short of the edges of said wing, the centralweb of said bail comprising a pair of juxtaposed bent portions whichtogether form a wall of double thickness, said bent portions beingintegral with said wing and being integrally connected to each other atthe ends of said bail.

24. A sheet metal slider for a slide fastener having a pair of parallelsheet metal wings interconnected bye neck, one of said wings beingimperforate and having an integral bail thereon which terminates shortof the edges of said wing, the central web of said bail comprising apair of abutted parallel walls integral with said wing and integrallyconnected to each other at the ends of said bail. h

25. A sheet metal slider for a slide fastener having a pair of parallelsheet metal wings interconnected by a neck, one of said wings beingimperforate and having an integral bail thereon which terminates shortof the edges of said wing and extends therefrom, said bail having acenhaving a pair of parallel sheet metal win s inwings integrally formedfrom the material of the wing in the vicinity of the bail, said ballterminating short "of the edges of said wing and comprising a web whichis directly connected to and extends integrally away from said wing anda rim on the extended edge of said web which projects to both sidesthereof, said rim being integrally connected to saidwing at the ends ofsaid ball.

22. A sheet metal slider for a slide fastener having a pair of parallelsheet metal wings interconnected by a neck, a bail on one of said wingsintegrally formed from the material of the wing in the vicinity oi thebail, said bail terminating shortof the edges of said wing and com--prising a web. which extends integrally away from said-wing and a rim onthe extended edge of said web which projects 'to both sides thereof,

terconnected by a neck, one of said wings being imperforate and havingan integral bail thereon,

said ball including a web comprising a pair of parallel abutted portionsintegral with and perpendicular to said wing and a wall disposedaboutthe outer periphery of said web, said wall having inturned longitudinaledge portions abutting said wall and integral with said web port one. I

27. A sheet metal slider for a slide fastener having a-pairof parallelsheet metal wings interconnected by a neck, one of said wings beingimperforate and having an integral bail thereon, said bail comprising athinned portion having a segment disposed in the plane of said wing, apair of parallel abutting segments forming the web of said bail, and asegment disposed about the periphery of said web part, said last segmenthaving inturned longitudinal edges integral with said web segments.

. ABRAHAM savrrzxr.

